Inheritances are generally not taxable to the recipient, as DoninGA pointed out.
The instructions for form 3520 state
"Who Must File
File Form 3520 if any one or more of the following apply. You are a U.S. person who, during the current tax year, received either:
...
4.
More than $100,000 from a nonresident alien individual or a foreign estate (including foreign persons related to that nonresident alien individual or foreign estate) that you treated as gifts or bequests"
So, if indeed, the amount is less than $100,000, you don't appear to be required to file the 3520. I agree that the Treasury Department will likely be notified of the transaction, but according to their own rules, you would not have to report it on form 3520.
But it is also a good idea to keep copies of documentation in your tax file, in case anyone ever asks about it.
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